Explanation: If the overall composition of the phase mixture is X, the lever rule gives the relative number of moles of α and β that must be present and the Gibbs free energy can be calculated from the molar energy curve for the phase.

Explanation: The properties of metallic material primarily depends on chemical composition and processing. This is the property that decides the microstructure that gets developed into the material.

Explanation: It primarily depends on undercooling and that provides for the energy to create surface, enveloping the product phase. Similarly as you cool a single phase material below a solvus the driving force of precipitation increases so cooling is basically the driving force of many processes.

Explanation: It is not possible to obtain any information about kinetics or the morphology of the phase mixture from the phase diagram. The diagram only gives information about the phases that can be in equilibrium under certain composition–temperature combinations. Although there are three different species present in a system, there are times when the phase diagram is presented as a binary phase diagram.

Explanation: The first step is to convert it into an unstable FCC arrangement, since was in a stable state it requires the optimum energy to continue in that state but to convert it into an unstable FCC arrangement, we require an increase in free energy.

Explanation: The most stable state, with the lowest free energy, is usually defined as the state in which the pure component has unit activity. The definition of activity can be shown graphically.

Explanation: In a heterogeneous system containing more than one phase the pure substance can exist in different crystal structures, the definition of heterogeneous system itself gives an idea about the statement.

Explanation: The Gibbs phase rule explains the number of phases that will be present in a system in equilibrium and is expressed as F+P = N+C. So here the F value is given as 1 and the N, C as 1 and 2 respectively, hence the P = 2.

Explanation: As the diffusion proceeds, the driving force for diffusion gradually decreases and vanishes when the chemical potentials of the components (A and B) become equal in both phases.

Explanation: The same activity concept defined for homogeneous system can be used to state the above mentioned condition. From the definition of activity coefficient, for an ideal solution, its value is unity for all the species. For a non-ideal solution, however, it may be either greater or less than unity, the larger the departure from unity the greater the non-ideality of the solution.